Commits on Apr 29, 2020

1. cli: disable block profiling by default …

   Disable block profiles by default as they consume a small but measurable
   amount of CPU: 1.5% of CPU in one tpcc experiment. Additionally, block
   profiling affects Pebble more than RocksDB as RocksDB's synchronization
   primitives are invisible to the Go runtime. This levels the playing
   field.
   
   Release note (performance improvement): Disable the Go runtime block
   profile by default which results in a small but measurable reduction in
   CPU usage. The block profile has diminished in utility with the advent
   of mutex contention profiles and is almost never used during performance
   investigations.

   

   petermattis committed Apr 29, 2020
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